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Summary of Significant Accounting Policies (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Goodwill [Line Items]    
Goodwill, Beginning Balance $ 5,790 $ 5,489
Goodwill Acquired During Period 377 298
Currency translation adjustments and other (16) 3
Goodwill, Ending Balance 6,151 5,790
Rig Technology [Member]
    
Goodwill [Line Items]    
Goodwill, Beginning Balance 1,854 1,567
Goodwill Acquired During Period 117 287
Currency translation adjustments and other (12)  
Goodwill, Ending Balance 1,959 1,854
Petroleum Services & Supplies [Member]
    
Goodwill [Line Items]    
Goodwill, Beginning Balance 3,859 3,855
Goodwill Acquired During Period 233 2
Currency translation adjustments and other (3) 2
Goodwill, Ending Balance 4,089 3,859
Distribution and Transmission [Member]
    
Goodwill [Line Items]    
Goodwill, Beginning Balance 77 67
Goodwill Acquired During Period 27 9
Currency translation adjustments and other (1) 1
Goodwill, Ending Balance $ 103 $ 77